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MCQs

Total Questions : 2607 | Page 87 of 261 pages
Question 861.
According to I.B.R., shearing resistance required to shear off the rivet per pitch length (in double shear) is (where n = Number of rivets per pitch length)2 
  1.    `pi/4 d^2 xx T xx n`
  2.    `1.875 xx pi/4 d^2 xx T xx n`
  3.    `2 xx pi/4 d^2 xx T xx n`
  4.    `3 xx pi/4 d^2 xx T xx n`
 Discuss Question
Answer: Option B. -> `1.875 xx pi/4 d^2 xx T xx n`


Question 862.

The power developed by a turbine is (where H = Head of water under which the turbine is working)


  1.    directly proportional to `H^(1//2)`
  2.    inversely proportional to `H^(1//2)`
  3.    directly proportional to` H^(3//2)`
  4.    inversely proportional to `H^(3//2)`
 Discuss Question
Answer: Option C. -> directly proportional to` H^(3//2)`


Question 863.

The relation between hydraulic efficiency (`eta_h`) mechanical efficiency (`eta_m`) and overall efficiency (`eta_o`) is


  1.    `eta_h = eta_o xx eta _m`
  2.    `eta_m = eta_o xx eta _h`
  3.    `eta_o = eta_h xx eta _m`
  4.    none of these
 Discuss Question
Answer: Option C. -> `eta_o = eta_h xx eta _m`


Question 864.
The maximum hydraulic efficiency of an impulse turbine is (where `phi` = Angle of blade tip at outlet)
  1.    `(1 + cos phi)/(2)`
  2.    `(1 - cos phi)/(2)`
  3.    `(1 +sin phi)/(2)`
  4.    `(1 - sin phi)/(2)`
 Discuss Question
Answer: Option A. -> `(1 + cos phi)/(2)`


Question 865.
The specific speed of a turbine is given by the equation
  1.    `(Nsqrt(P))/(H^(3//2))`
  2.    `(Nsqrt(P))/(H^2)`
  3.    `(Nsqrt(P))/(H^(5//4))`
  4.    `(Nsqrt(P))/(H^3)`
 Discuss Question
Answer: Option C. -> `(Nsqrt(P))/(H^(5//4))`


Question 866.

Power required (in watts) to drive a centrifugal pump is (where Hm = Manometric head in metres, w = Specific weight in N/m3, Q = Discharge of the pump in m3/s, and `eta_o`= Overall efficiency of the pump)


  1.    `(w.H_m)/(Q xx eta_o)`
  2.    `(w.Q.H_m)/(eta_o)`
  3.    `(w.Q )/(H_m xx eta_o)`
  4.    `(w.Q xx eta_o)/(H_m)`
 Discuss Question
Answer: Option B. -> `(w.Q.H_m)/(eta_o)`


Question 867.
The force exerted by a jet of water (in a direction normal to flow)
impinging on a fixed plate inclined at an angle θ with the jet is
  1.    `(waV)/(2g) xx sin theta`
  2.    `(waV)/(g) xx sin theta`
  3.    `(waV^2)/(2g) xx sin 2theta`
  4.    `(waV^2)/(g) xx sin 2theta`
 Discuss Question
Answer: Option C. -> `(waV^2)/(2g) xx sin 2theta`


Question 868.

Discharge (Q) of a centrifugal pump is given by (where D = Diameter of impeller at inlet, b = Width of impeller at inlet, and Vf = Velocity of flow at inlet)


  1.    `Q = pi .D.V_f`
  2.    `Q = pi .b.V_f`
  3.    `Q = pi .D.b.V_f`
  4.    `Q = D.b.V_f`
 Discuss Question
Answer: Option C. -> `Q = pi .D.b.V_f`


Question 869.
heoretical power required (in watts) to drive a reciprocating pump is (where w = Specific weight of liquid to be pumped in N/m3, Q = Discharge of the pump in m3/s, Hs = Suction head in metres, and Hd = Delivery head in metres) 
  1.    `wQH_s`
  2.    `wQH_d`
  3.    `wQ(H_s - H_d)`
  4.    `wQ(H_s + H_d)`
 Discuss Question
Answer: Option D. -> `wQ(H_s + H_d)`


Question 870.

The discharge of a double acting reciprocating pump is (where L = Length of stroke, A = Cross-sectional area of piston, and N = Speed of crank in r.p.m.)


  1.    L.A.N
  2.    2 L.A.N
  3.    `(L.A.N)/(60)`
  4.    `(2L.A.N)/(60)`
 Discuss Question
Answer: Option D. -> `(2L.A.N)/(60)`


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